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ŠUMARSKI LIST 9-10/1989 str. 32     <-- 32 -->        PDF

Klcpac , M., 1956: Istraživanja debljinskog prirasta jele u najraširenijim fitocenozama
Gorskog kotara, Glas. za šum. pokuse, br. 12, 225—256 str.
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P r a n j i ć, A., 1986: Biometrika, SN »Liber«, 205 str.
Pranjić , A. & N. L u k i ć, 1989: Prirast stabala hrasta lužnjaka kao indikator
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Uputstva za provođenje ankete »Umiranje šuma«, Šumarski fakultet Sveučilišta u
Zagrebu, Zagreb, 1987.


DECREASE OF FIR (Abies alba L.) INCREMENT AS RESULT OF FOREST
DECLINE IN GORSKI KOTAR


Summary


The authors investigated the increment decrease with increasing damage
stage of fir tress in forest region of Gorski kotar (Yugoslavia), where the problem
of forest decline has become greater and greater, and reached the dangerous level
in some parts of region. The boring cores were colected during the field work
performed for establishing the photointerpretation key. The mean annual diameter
increment have been calculated according to time of passage for every stage of
damage. The diameter increment was fited by repression analysis for every stage
of damage by formula y = b0 xbl. The results of analysis show us that trees, damaged
between 46—60% lost 53% of diameter increment.


The mean annual diameter increment obtained for the population of healthy
trees (dbh = 69,6 cm) of 5,04 mm lie in the upper half of range (3,30—5,90 mm)
of mean annual diameter increments calculated by Klepac, 1956 for main plant
associations in Gorski kotar.


Key words : fir (Abies alba L.), stage of demage, diameter increment.